When charging, the battery indicator on the screen stays the same at about 3/4 of the rectangle. I left it for about 5 hours and it still isn’t fully charged. When I unplug it to use it for 5 minutes, the calculator battery instantly drops to about 1/4 of the rectangle.
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As brandon k pointed out, that behavior likely means the battery is shot and you’ll need to replace it. There’s a guide to help you with that here: Sostituzione batteria Texas Instruments TI-84 Plus CE
Be careful because the battery may have swelled and could cause a fire if you mess with it too roughly.
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From what you described it sounds like the battery(s) need replaced.
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